Dear Freerunner owners in the EU harmonized market,
a known problem of the Neo Freerunner design is that the headset
output lacks some low frequency signals (bass). Thererfore music
played through the headsets does not sound as expected and compared to
other digital music players.
There is an improvement rework by adding larger coupling capacitors to
the output amplifier. This became known as the Bass Rework (http://wiki.openmoko.org/wiki/GTA02_bass_fix
). Although there is a description of a rework solution (http://people.openmoko.org/andy/additional-headset-audio-caps.pdf
) we do not expect that you can do it yourself and not in the required
quality. Just a note what the problem is: we need 47 uF in 0805
dimensions and they are a little expensive and difficult to get and
space is very close. Therefore, we have worked on a professional
approach.
With the help of a local SMD specialist company in Munich, we can now
offer a rework service to those who want to improve audio quality. The
price is 49 EUR (incl. German VAT) plus shipment.
Details can be found at:
http://www.handheld-linux.com/wiki.php?page=Bass-Rework
Finally a note of caution: acoustic quality is very subjective so that
we can't guarantee that the result is good enough for your
expectations. We can only guarantee that there is a technical
improvement.
Nikolaus Schaller
Some Pictures
How the rework looks like:
http://www.handheld-linux.com/images/Bass-Rework1.jpg
Oscilloscope signals of a sine wave sweeping from 10 Hz to 100 Hz (for
an original unit and for a reworked unit):
http://www.handheld-linux.com/images/Bass-Rework2.jpghttp://www.handheld-linux.com/images/Bass-Rework3.jpg
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Mobile Office Solutions
by Golden Delicious Computers GmbH&Co. KG
Buchenstr. 3
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+49-89-54290367
http://www.handheld-linux.com
AG München, HRA 89571
VAT DE253626266
Komplementär:
Golden Delicious Computers Verwaltungs GmbH
Oberhaching, AG München, HRB 16602
Geschäftsführer: Dr. Nikolaus Schaller
Digital Tools for Independent People
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